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A. LEM'KE. Look.

No. 234,592. Patented Nov. I6, 1880.

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No. 234,592. Patented Nov. I6, 1880.

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A. LEMKE. Look.

No. 234,592. Patented Nov. 16, i880.

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No. 234,592. Patented Nov. 16, I880.

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ALPHONS LEMKE, ()F ASOHAFFENBURG, BAVARIA.

LOCK.

SPECIFICATION forming part of Letters Patent No. 234,592, dated November16, 1880.

Application filed November 20, 1877. Patented in France September 11,1877, in Italy October 25, 1877, in England September 17, 1877, and inGermany August 26, 1877.

To all whom it may concern:

Be it known that I, ALPnoNs LEMKE, of Aschaffenburg, in the Kingdom ofBavaria, German Empire, have invented certain Improvements inDoor-Locks, of which the following is a specification.

The present invention has reference to that class of locks in which theopening operation is effected by electromagnetism or air-pressure; andthe invention consists in the construction and combination of partswhich will be hereinafter more fully explained and claimed, so as toenable others skilled in the art to make and use the same.

In the accompanying drawings, forming part of this specification,Figures 1 and 2 are face views of a lock having electro magnets andarmature, and representing the latchbolt, respectively, in a projectedand retracted position. Figs. 3 and 4 are similar views, showing amodification in which a flexible air bulb or sack is used for openingthe lock.

As shown in Figs. 1 to 4, inclusive, the sliding latch-bolt A isretracted or drawn back into the lock -casing by means of a doublearmedor centrally-pivoted lever, B, having its lower arm connected with acoiled spring, 0, which serves to throw the lower arm of the lever tothe left and the upper arm to the right for projecting the latch-boltinto the door-frame or lock-strike.

When the bolt A is in a projected position the lower arm of the lever Bengages with the hub D of a trigger, at, said hub being provided with alocking shoulder or projection, I), for this purpose. The upper end ofthe lever is retained by means of a doublearmed lever, F F, the arm F of:which serves as an armature, which is attracted by the electro-magnetswhen the electric current is passing through the same.

The movement of the armature-lever is regulated or defined by means of aset-screw, f, and a spring, g, serves to withdraw it from the magnets.

As shown in Fig. l, the lock is represented in a locked position. Inorder t retract the bolt a current of electricity is made to p throughthe magnets, which then attract the armature F, and the arm F isreleased from engagement with the trigger-arm d. Consequently the spring0 operates the lever B and throws the latch bolt back, also throwingforward at the same time a second bolt, K, having an inclined nose orfront face, said bolt serving to open the door. This result is effectedby causing the said bolt K, as it is thrown forward, to engage with aninclined projection, is, of the lockstrike, or a plate applied to thedoor-frame.

The bolt-K also has for its object to set the mechanism when the door isshut. As the bolt K strikes the door-frame or look strike thespring-tongue t of-said bolt bears against the projection 'i of thelever B and presses the same back, so as to cause its lower end toengage with the shouldered hub D of the trigger-arm d. This operationwill cause said trigger to engage with the armature or looking-lever FF, for maintaining the latch-bolt A in a projected position. A coiledspring, K having an arm, serves to throw the bolt K forward when it isreleased from the lever mechanism.

The latch-bolt can also be operated independently of the mechanismheretofore described by means of a lever, M, and an elbowarm, L. Theformer is moved by the key, which serves to operate the ordinarylock-bolt, and the elbow-arm is connected with the ordinaryknob-spindle.

Instead of the electro magnets and armature, 1 also propose to use aflexible a-ir bulb or bag, H, which is applied to a supportingplatecarrying a spring-pressed lever, F The latter engages with thetrigger-arm in the same manner and for the same purpose as thearmature-lever.

The air-bag, when inflated by means of a suitable air-tube, will serveto turn the lever F thus releasing the trigger and the lever mechanismfrom the latch-bolt and throwing the same back.

Having thus described my invention, what I claim as new, and desire tosecure by Lette Patent, is-- The pivoted lever B, having projection i,spring 0, trigger (I, provided with hub D and shoulder I), anddouble-armed lever for locking and releasing the trigger, in combinationwith electro-magnets or an equivalent releasin g device, latch-bolt A,and bolt K, substantially as herein set forth.

i In testimony whereof I have signed my nznne to this specification inthe presence of two subscribing witnesses.

ALPHONS LEMKE. Vitnesses:

PAUL EMIL FIRsonING, Gnone SELBERT.

